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xtickmarksxtickmarks =n正整数设置横坐标轴标号个数

Plotting Options (English help)

The style of the displayed graph may be controlled with a number of plotting options embedded in the plotting command. For

instance the command

> plot3d(x^2+y^2, x=-1..1, y=-1..1, style=wireframe, grid=[15,15]);

displays the graph in wireframe using a

15x15

grid. (Dynagraph's default action is to display the graph as a solid surface using

an (invisible) grid of

25x25

.)

All options take the form option=value. These can be supplied to the plotting command in any order, separated by commas.

The following list describes all the options recognized by dynagraph. These form a subset of options available in Maple. The

listing below has been obtained mostly by cut-and-paste from Maple's online help. The options

pointsize

and the option values

x_gridlines

and

y_gridlines

are specific to dynagraph and do not exist in Maple.

Option values which are keywords, such as

WIREFRAME

or

HELVETICA

can be typed either in all uppercase or all lowercase.

Therefore

axesfont=[HELVETICA,10]

and

axesfont=[helvetica,10]

are equivalent. In the listing below only the uppercase variants are

shown.

Alphabetical listing of all options

axes=f

This option specifies how the axes are to be drawn, where

f

is one of

BOXED

,

NORMAL

,

FRAME

, and

NONE

.

Default:

axes=NONE

Remark: In this release of dynagraph all axes options other than

NONE

are treated as synonymous with

BOXED

. This

may be fixed in future releases.

axesfont=l

This option defines the font for the labels on the tick marks of the axes, specified in the same manner as font.

Default:

axesfont=[HELVETICA,10]

color=colorname

Prescribes a solid color for the object.

Colorname

may be any color name recognizable by the X server, such as "red" or

"MidnightBlue", or an RGB specification such as "#009000". It must be quoted if it contains non-alphanumeric

characters. For the convenience of our continental friends,

colour

is provided as a synonym to

color

.

contours=n

This option specifies the number of contours in a contour plot.

Default:

contours=10

coords=c

This option specifies the coordinate system to be used, where

c

is one of

CARTESIAN

,

SPHERICAL

,

CYLINDRICAL

,

Z_CYLINDRICAL

.

Default:

coords=CARTESIAN

font=fontspec

This option defines the font for text objects in the plot.

Fontspec

is a list of the form

[family,style,size]

, where family is one of

TIMES

,

COURIER

,

HELVETICA

, and

SYMBOL

. For

TIMES

, style may be one of

ROMAN

,

BOLD

,

ITALIC

or

BOLDITALIC

. For

HELVETICA

and

COURIER

style may be omitted or select one of

BOLD

,

OBLIQUE

, or

BOLDOBLIQUE

.

SYMBOL

does not accept

a style option. The final value, size, is the point size to be used.

Default:

font=[HELVETICA,10]

grid=[m,n]

This option specifies the dimensions of the rectangular grid to use to represent a surface.

Default:

grid=[25,25]

gridstyle=x

This option specifies the type of mesh which is drawn to represent the surface. The value of

x

is one of

RECTANGULAR

,

TRIANGULAR

,

X_GRIDLINES

,

Y_GRIDLINES

. (

XY_GRIDLINES

is also provided as a synonym for

RECTANGULAR

.) Note that these

options set the mesh style but do not cause the mesh to be drawn. The drawing of the mesh is determined by the value

of the

style

option described below.

Default:

gridstyle=RECTANGULAR

labelfont=l

This option defines the font for the labels on the axes of the plot, specified in the same manner as font.

Default:

labelfont=[HELVETICA,12]

labels=[x,y,z]

This option specifies labels for the axes. The values of

x

,

y

, and

z

must be strings. The default label for the

x

and

y

axes

are the names of the variables for the

x

and

y

axes and no label on the

z

axis. Labels are shown only when the

coords=CARTESIAN

is in effect.

linewidth=n

Same as thickness=n

numpoints=n

When plotting a surface this option specifies the minimum total number of points to be generated (default 625 = 25^2).

Plot3d will use a rectangular grid of dimensions ~= sqrt(n). When plotting a spacecurve or a tube, this option specifies

the number of points to use along the curve or along the axis of the tube. The default is 60.

orientation=[longitude,colatitude]

This option sets the viewing position at a point at infinity along the ray given by the spherical coordinates

(longitude,colatitude), looking towards the origin.

Default:

orientation=[45,45]

pointsize=n

This option defines the size (in pixels) of points drawn in the plots.

n

should be an integer from 0 to 10. 0 selects the

default pointsize.

Default:

pointsize=3

scaling=s

This option specifies whether the surface should be scaled so that it fits the screen with axes using a relative or

absolute scaling, where s is either

UNCONSTRAINED

or

CONSTRAINED

. The dynagraph graphics window is initially set to

scaling=CONSTRAINED

. The user may toggle the

CONSTRAINED/UNCONSTRAINED

button at will. Subsequent graphs will

obey the button's setting unless specified otherwise on the command line.

shading=s

This option specifies how the surface is colored, where

s

is one of

XYZ

,

XY

,

Z

,

ZGREYSCALE

,

ZHUE

,

NONE

.

Default:

shading=XYZ

style=s

This specifies how the surface is to be drawn, where

s

is one of

POINT

,

HIDDEN

,

PATCH

,

WIREFRAME

,

CONTOUR

,

PATCHNOGRID

,

PATCHCONTOUR

, or

LINE

.

Default:

style=PATCHNOGRID

Remark:

LINE

is synonymous with

WIREFRAME

thickness=n

This option defines the thickness (in pixels) of lines in the plots.

n

should be an integer from 0 to 10. 0 selects the

default thickness.

Default:

thickness=1

tickmarks=[l,n,m]

This option specifies reasonable numbers no less than

l

,

n

and

m

should be marked along the x-axis, y-axis, and z-axis,

respectively. Each tickmarks value must be a positive integer or zero, in which case no tickmarks will drawn on the

corresponding axis.

Default:

tickmarks=[5,5,5]

title=t

This option specifies a title for the plot. The value of t must be a string. The two-character sequence n (that is, a

backslash followed by n) acts as a line break within the title string, thus making multi-line titles possible. Each line of a

multi-line title is horizontally centered within the window.

Default: no title

titlefont=l

This option defines the font for the title of the plot, specified in the same manner as font.

Default:

titlefont=[HELVETICA,BOLDOBLIQUE,14]

tuberadius=r

This sets the radius of the tube in a tubeplot.

Default:

tuberadius=1.0

tubepoints=n

This sets the number of points to use for drawing each cross-section of a tubeplot. Note that the circular cross section

will appear to have only

n-1

equally-spaced points on its circumference, because the first and last points coincide.

Default:

tubepoints=16

ax

or

view=[ax]

This option indicates the minimum and maximum coordinates of the surface to be displayed on the screen.

Default: displays the entire surface

/~rouben/dynagraph/

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